[regression](nereids) check tpc-h 1G/500G/1T plan if backend_num == 1 #18848

cases in nereids_tpch_shape_sf1_p0, nereids_tpch_shape_sf500_p0 and nereids_tpch_shape_sf1000_p0 are only for one be environment

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q1.groovy

@@ -24,6 +24,12 @@ suite("q1") {
     sql 'set enable_fallback_to_original_planner=false'
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
 
     qt_select """
     explain shape plan

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q10.groovy

@@ -26,9 +26,11 @@ suite("q10") {
 
     sql 'set exec_mem_limit=21G'
 
-
-
-    
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q11.groovy

@@ -25,7 +25,11 @@ suite("q11") {
     sql "set runtime_filter_mode='GLOBAL'"
 
     sql 'set exec_mem_limit=21G'
-
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
 
 
     

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q12.groovy

@@ -25,10 +25,11 @@ suite("q12") {
     sql "set runtime_filter_mode='GLOBAL'"
 
     sql 'set exec_mem_limit=21G'
-
-
-
-    
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q13.groovy

@@ -29,7 +29,11 @@ suite("q13") {
 
 
 
-    
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q14.groovy

@@ -26,9 +26,11 @@ suite("q14") {
 
     sql 'set exec_mem_limit=21G'
 
-
-
-    
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q15.groovy

@@ -29,6 +29,12 @@ suite("q15") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q16.groovy

@@ -29,6 +29,12 @@ suite("q16") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q17.groovy

@@ -29,6 +29,12 @@ suite("q17") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q18.groovy

@@ -29,6 +29,12 @@ suite("q18") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q19.groovy

@@ -30,6 +30,12 @@ suite("q19") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q2.groovy

@@ -29,6 +29,12 @@ suite("q2") {
 
 
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q20.groovy

@@ -30,6 +30,12 @@ suite("q20") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q21.groovy

@@ -29,6 +29,55 @@ suite("q21") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
+    qt_select """
+    explain shape plan
+        select
+                s_name,
+                count(*) as numwait
+        from
+                supplier,
+                lineitem l1,
+                orders,
+                nation
+        where
+        s_suppkey = l1.l_suppkey
+        and o_orderkey = l1.l_orderkey
+        and o_orderstatus = 'F'
+        and l1.l_receiptdate > l1.l_commitdate
+        and exists (
+                select
+                *
+                from
+                lineitem l2
+                where
+                l2.l_orderkey = l1.l_orderkey
+                and l2.l_suppkey <> l1.l_suppkey
+        )
+        and not exists (
+                select
+                *
+                from
+                lineitem l3
+                where
+                l3.l_orderkey = l1.l_orderkey
+                and l3.l_suppkey <> l1.l_suppkey
+                and l3.l_receiptdate > l3.l_commitdate
+        )
+        and s_nationkey = n_nationkey
+        and n_name = 'SAUDI ARABIA'
+        group by
+        s_name
+        order by
+        numwait desc,
+        s_name
+        limit 100;
+    """
     // qt_select """
     // explain shape plan
     //     select

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q22.groovy

@@ -29,6 +29,12 @@ suite("q22") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q3.groovy

@@ -30,6 +30,12 @@ suite("q3") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
     qt_select """
     explain shape plan
     select  

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q4.groovy

@@ -23,8 +23,12 @@ suite("q4") {
     sql 'set enable_nereids_planner=true'
     sql 'set enable_fallback_to_original_planner=false'
     sql "set runtime_filter_mode='GLOBAL'"
-
     sql 'set exec_mem_limit=21G'
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }   
 
 
 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q5.groovy

@@ -29,6 +29,12 @@ suite("q5") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q6.groovy

@@ -29,6 +29,12 @@ suite("q6") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q7.groovy

@@ -29,6 +29,12 @@ suite("q7") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q8.groovy

@@ -29,6 +29,12 @@ suite("q8") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1000_p0/shape/q9.groovy

@@ -29,6 +29,12 @@ suite("q9") {
 
 
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q1.groovy

@@ -23,8 +23,11 @@ suite("q1") {
     sql 'set enable_nereids_planner=true'
     sql 'set enable_fallback_to_original_planner=false'
     sql 'set exec_mem_limit=21G'
-
-
+    
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        return;
+    }
     qt_select """
     explain shape plan
     select

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q10.groovy

@@ -26,6 +26,12 @@ suite("q10") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q11.groovy

@@ -26,6 +26,12 @@ suite("q11") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select  

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q12.groovy

@@ -26,6 +26,12 @@ suite("q12") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q13.groovy

@@ -26,6 +26,12 @@ suite("q13") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q14.groovy

@@ -26,6 +26,12 @@ suite("q14") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q15.groovy

@@ -26,6 +26,12 @@ suite("q15") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q16.groovy

@@ -26,6 +26,12 @@ suite("q16") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q17.groovy

@@ -26,6 +26,12 @@ suite("q17") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q18.groovy

@@ -26,6 +26,12 @@ suite("q18") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q19.groovy

@@ -27,6 +27,12 @@ suite("q19") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q2.groovy

@@ -26,6 +26,12 @@ suite("q2") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q20.groovy

@@ -27,6 +27,12 @@ suite("q20") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q21.groovy

@@ -26,6 +26,12 @@ suite("q21") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q22.groovy

@@ -26,6 +26,12 @@ suite("q22") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q3.groovy

@@ -27,6 +27,12 @@ suite("q3") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select  

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q4.groovy

@@ -26,6 +26,12 @@ suite("q4") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select  

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q5.groovy

@@ -26,6 +26,13 @@ suite("q5") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q6.groovy

@@ -26,6 +26,13 @@ suite("q6") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q7.groovy

@@ -26,6 +26,13 @@ suite("q7") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q8.groovy

@@ -26,6 +26,12 @@ suite("q8") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf1_p0/shape/q9.groovy

@@ -26,6 +26,12 @@ suite("q9") {
 
     sql 'set exec_mem_limit=21G'
 
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q1.groovy

@@ -24,6 +24,13 @@ suite("q1") {
     sql 'set enable_fallback_to_original_planner=false'
     sql 'set exec_mem_limit=21G'
 
+    
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
 
     qt_select """
     explain shape plan

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q10.groovy

@@ -29,6 +29,12 @@ suite("q10") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q11.groovy

@@ -29,6 +29,12 @@ suite("q11") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select  

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q12.groovy

@@ -29,6 +29,12 @@ suite("q12") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q13.groovy

@@ -25,11 +25,13 @@ suite("q13") {
     sql "set runtime_filter_mode='GLOBAL'"
 
     sql 'set exec_mem_limit=21G'
-
-
-
-
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+   
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q14.groovy

@@ -25,9 +25,12 @@ suite("q14") {
     sql "set runtime_filter_mode='GLOBAL'"
 
     sql 'set exec_mem_limit=21G'
-
-
-
+    
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
     
     qt_select """
     explain shape plan

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q15.groovy

@@ -29,6 +29,12 @@ suite("q15") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q16.groovy

@@ -29,6 +29,12 @@ suite("q16") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q17.groovy

@@ -29,6 +29,12 @@ suite("q17") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q18.groovy

@@ -29,6 +29,12 @@ suite("q18") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q19.groovy

@@ -30,6 +30,12 @@ suite("q19") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q2.groovy

@@ -28,6 +28,14 @@ suite("q2") {
 
 
 
+    
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
+
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q20.groovy

@@ -30,6 +30,12 @@ suite("q20") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q21.groovy

@@ -29,6 +29,12 @@ suite("q21") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q22.groovy

@@ -29,6 +29,12 @@ suite("q22") {
 
 
     
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+    
     qt_select """
     explain shape plan
         select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q3.groovy

@@ -30,6 +30,15 @@ suite("q3") {
 
 
     
+
+        
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
+
     qt_select """
     explain shape plan
     select  

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q4.groovy

@@ -29,6 +29,14 @@ suite("q4") {
 
 
     
+        
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
+
+
     qt_select """
     explain shape plan
     select  

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q5.groovy

@@ -25,10 +25,13 @@ suite("q5") {
     sql "set runtime_filter_mode='GLOBAL'"
 
     sql 'set exec_mem_limit=21G'
+        
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
 
-
-
-    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q6.groovy

@@ -24,11 +24,14 @@ suite("q6") {
     sql 'set enable_fallback_to_original_planner=false'
     sql "set runtime_filter_mode='GLOBAL'"
 
-    sql 'set exec_mem_limit=21G'
+    sql 'set global exec_mem_limit = 21G'
+        
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
 
-
-
-    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q7.groovy

@@ -25,10 +25,13 @@ suite("q7") {
     sql "set runtime_filter_mode='GLOBAL'"
 
     sql 'set exec_mem_limit=21G'
+  
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
 
-
-
-    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q8.groovy

@@ -25,10 +25,12 @@ suite("q8") {
     sql "set runtime_filter_mode='GLOBAL'"
 
     sql 'set exec_mem_limit=21G'
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
 
-
-
-    
     qt_select """
     explain shape plan
     select 

regression-test/suites/nereids_tpch_shape_sf500_p0/shape/q9.groovy

@@ -26,8 +26,11 @@ suite("q9") {
 
     sql 'set exec_mem_limit=21G'
 
-
-
+    def result = sql "show backends;"
+    if (result.size() != 1) {
+        print("backends num: ${result.size()}");
+        return;
+    }
 
     qt_select """
     explain shape plan